_French Subdivisions._ _English Equivalents._
A. 1. Gypseous series of Mont 1. Bembridge series.
Montmartre.
A. 2. Calcaire silicieux, or 2. Osborne and Headon series.
Travertin Inferieur.
A. 3. Gres de Beauchamp, or 3. White sand and clay of
Sables Moyens. Barton Cliff, Hants.
MIDDLE EOCENE.
B. 1. Calcaire Grossier. 1. Bagshot and Bracklesham beds.
B. 2. Soissonnais Sands, or 2. Wanting.
Lits Coquilliers.
LOWER EOCENE.
C. 1. Argile de Londres at base 1. London clay.
of Hill of Cassel, near
Dunkirk.
C. 2. Argile plastique and 2. Plastic clay and sand with
lignite. lignite (Woolwich and Reading
series).
C. 3. Stables de Bracheux. 3. Thanet sands.
III. EOCENE STRATA OF THE UNITED STATES.--The lowest member of
the Eocene deposits of North America is the so-called "_Lignitic
Formation_," which is largely developed in Mississippi, Tennessee,
Arkansas, Wyoming, Utah, Colorado, and California, and sometimes
attains a thickness of several thousand feet. Stratigraphically,
this formation exhibits the interesting point that it graduates
downwards insensibly and conformably into the Cretaceous, whilst
it is succeeded _uncomformably_ by strata of Middle Eocene age.
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